The ancient monument of stonehenge is one of the most spectacular sights of southern england. why stonehenge (a11) is still a mistery. there was a theory which stated that it (a12) a type of astronomical clock or calendar, by which the people of that time (a13) the seasons, hours of the day and the phases of the moon. however, up till now this theory (a14) . but there is no doubt that if the people who (a15) stonehenge (a16) considerable engineering skills they (a17) to raise the enormous stones to make up the monument. stonehenge is structurally unique among european prehistoric monuments and (a18) a large number of visitors every year. quite recently the government (a19) the closure of the site because a number of stones (a20) to be unstable and now the remarkable monument can only be seen from a distance. a11. 1) has built 2) had built 3) was building 4) was built a12. 1) has been 2) had been 3) was 4) was being a13. 1) had calculated 2) were being calculated 3) had been calculated 4) were calculated a14. 1) hadn't proved 2) hadn't been proved 3) didn't prove 4) hasn't been proved a15. 1) were building 2) had been built 3) were built 4) have been building a16. 1) didn't possess 2) were not possessing 3) hadn't possessed 4) were not possessed a17. 1) weren't able 2) wouldn't be able 3) hadn't been able 4) wouldn't have been able a18. 1) is attracted 2) attracts 3) was attracting 4) has been attracted а19. 1) has announced 2) had announced 3) was announced 4) was announcing a20. 1) are considering 2) are considered 3) have considered 4) had been considering

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a11. 4) was built
Explanation: The sentence is talking about the ancient monument of Stonehenge in the past, indicating that it was built at some point in the past.

a12. 3) was
Explanation: The sentence is talking about a theory that existed in the past, indicating that it was there at a specific time and not ongoing.

a13. 4) were calculated
Explanation: The sentence is describing the actions of the people of that time, indicating that they used to calculate the seasons, hours of the day, and the phases of the moon.

a14. 2) hadn't been proved
Explanation: The sentence is referring to the current state of the theory mentioned earlier, indicating that it has not been proven up until now.

a15. 3) were built
Explanation: The sentence is describing the actions of the people in the past in relation to the construction of Stonehenge, indicating that it was built by them.

a16. 3) hadn't possessed
Explanation: The sentence is talking about the people of that time and their possession of considerable engineering skills, indicating that they did not possess those skills.

a17. 3) hadn't been able
Explanation: The sentence is talking about the abilities of the people in the past, indicating that they were not able to raise the enormous stones without those engineering skills.

a18. 2) attracts
Explanation: The sentence is talking about the present state of Stonehenge, indicating that it continues to attract a large number of visitors every year.

a19. 1) has announced
Explanation: The sentence is referring to a recent action by the government regarding the closure of the site, indicating that they have recently announced it.

a20. 4) had been considering
Explanation: The sentence is referring to the actions of the government in the past, indicating that they had been considering the closure of the site due to the instability of the stones.